tree b200960d04b0a955aaf9a101d6f0a4ed34f07bb2
parent 09a40af5240de02d848247ab82440ad75b31ab11
author Peter Zijlstra <a.p.zijlstra@chello.nl> 1271965819 +0200
committer Ingo Molnar <mingo@elte.hu> 1272013322 +0200

sched: Cure load average vs NO_HZ woes

Chase reported that due to us decrementing calc_load_task prematurely
(before the next LOAD_FREQ sample), the load average could be scewed
by as much as the number of CPUs in the machine.

This patch, based on Chase's patch, cures the problem by keeping the
delta of the CPU going into NO_HZ idle separately and folding that in
on the next LOAD_FREQ update.

This restores the balance and we get strict LOAD_FREQ period samples.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Chase Douglas <chase.douglas@canonical.com>
LKML-Reference: <1271934490.1776.343.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>